Improvement in gages for circular saws



c. 1. ULMER. r Gages for Circular-Saws. No. 138,453.PatentedApri|29J8791 WITNESSES. INVENTORZ 4M 5% AM. PHOTO-UTHOGRAFH/U00. M X(asaams's Pnocbss) v 'UNITED STATES PATENT OFFICE.

CHARLES J. ULMER, OF EAST CAMBRIDGE, MASSACHUSETTS.

IMPROVEMENT IN GAGES FOR CIRCULAR SAWS.

Specification forming part of Letters Patent No.138,453, dated April 29,1873; application filed April 2, 1873. I

To all whom it may concern:

Be it known that I, CHARLES J. UL1vrEn,of East Cambridge, in the countyof Middlesex and State of Massachusetts, have invented Improvements inGages for Circular Saws; and I do hereby declare that the following,taken in connection with the drawing which accompanies and forms partof. this specification, is a description of my invention sufficient toenable those skilled in the art to practice it.

My invention relates to the construction of an adjustable gage mechanismfor circular-saw machines, the invention being particularly intended forlath-machines.

The gage is generally fixed to slide-bars and y is adjusted in positionby means of bolts, nuts,

and slots, each change of position requiring the nuts to be loosened andtightened by a Wrench.

In my invention I attach the guide to a slide-bar moving in suitablebearings and having a gear-rack on one edge, and upon the table uponwhich such slide moves I pivot a lever having at its end a toothed orgear-segment, the teeth of which, as the lever is turned, mesh into theteeth of the gage-bar and move the gage in or out. Upon the table,concentric with the fulcrum of this lever, I fix a notched semicircularor curved plate, into any notch of which a tooth on the under side ofthe lever will spring when the lever is brought over such notch, thelever being formed of steel and having spring sufficient to enable it tobe drawn up to raise the tooth to the top of the notched plate and tohold the tooth firmly in the notch when the lever is released.

By means of the slidegear and gage-bar, the gear-segment lever, and thenotched plate, the

gage may be instantly adjusted, and, when positioned, is held as firmlyas if bolted to the table.

My invention consists in the construction or arrangement thus generallydescribed.

The drawing represents a gage and its adjusting mechanism embodying theinvention.

Figure 1 shows the mechanism in plan. Fig. 2 is a central cross-section.

a denotes the gage at the end of a bar, b,

that, with the gage, slides upon the table, the

lever is turned, the lever being formed of spring-steel, and the stressof the spring holding the tooth firmly in the notch, but permitting theouter arm of the lever to be raised sufficiently to swing the tooth overthe plate from notch to notch.

By moving the lever the gage is slid in either direction to position itwith relation to the saw, and thereby adjust the width or thickness cutby the saw.

I claim- The sliding gage and gear-bar b, lever 9, segment f, tooth l,and notch-plate i, when constructed, combined, and relatively arranged,substantially as and for the purpose specified.

O. J. ULMER.

Witnesses:

FRANCIS GOULD, M. W. FROTHINGHAM.

The plate has notches in cut

